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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.